I guess you missed the word "approximate" in GWE's post. GWE overestimates the cost in their calculation by a few dollars per month which seems like a reasonable thing to do... I don't think it has anything to do with trying to fool people into 10 month years, although viewing it from this perspective certainly does fall within your pattern of negativity/closed-mindedness/paranoia.

I'm sorry your math skills are such that it took "a while" to figure out that 150 / 15 = 10